Configuring For Ratio Measurements - Agilent Technologies 3458A User Manual

Configuring for Ratio Measurements

70 Chapter 3 Configuring for Measurements
percent for the synchronous conversion method or 0.4 percent for the random
conversion method.) The following program selects AC voltage
measurements using the synchronous sampling conversion. The maximum
expected input voltage is 10 volts and a %_resolution parameter of .1 selects
5.5 digits resulting in an actual resolution of l mV.
10 OUTPUT 722; "SETACV SYNC"
20 OUTPUT 722;"ACV 10, .1"
30 END
For ratio measurements, the multimeter measures a DC reference voltage
applied to the W Sense terminals and a signal voltage applied to the Input
terminals. The multimeter then computes the ratio as:
Signal Voltage
= --------------------------------------------------
atio
DC Reference Voltag
The signal voltage measurement function can be DC voltage, AC voltage, or
AC+DC voltage. (For AC or AC+DC voltage, any of the three measurement
methods ANA, RNDM, or SYNC may be used.) The reference voltage
measurement function is always DC voltage and has a maximum measurable
input of ± 12VDC. Figure 15 shows the front connections for ratio
measurements
W Sense LO and the Input LO terminals must have a common
Note
The
reference and cannot have a voltage difference greater than 0.25V
.
Figure 15. Ratio measurement connections